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ISS of three profiles

I don't agree with his method either and I don't suggest to use such a high GFlow only to avoid stops below 21m. But it's good to see that Andy thinks about the breathing gas in relation to the choice of GF, that's why I added the link. It's also a hint to adjust in the opposite direction: if...

If it's true, that's sad. I think such things happen more often but are not reported. We had a fatal OOG accident last year here in a lake and nobody understood how it could happen to an experienced tech diver with a lot of redundant gas on a relatively easy dive. A witness later told me, the...

I think you confuse cleaning with anti-fog treatment. There's nothing wrong with cleaning the mask. But a dirty mask doesn't necessarily fog more than a clean mask, and even a very clean mask will fog in cold water. My bathroom mirror is very clean, never had any silicon residue on it, and yet...

back to OP... Two things to consider: A) how quickly and reliably can I provide gas to a diver who is really OOG and needs it immediately? B) how easy and convenient is it to exit, go through restrictions, swim in current, hold on an ascent line, do a free ascent, ... Two very different...

I don't think one can decide well on a GF without considering the deco gas and gas switches. Two things are here in a trade off: a) want to go shallow fast to avoid further on-gassing b) want to stay deep to reduce over-saturation of tissues and DCS Item (b) depends only on depth and is...

Certain types of plastic are not resistant to freezing temperatures, become more brittle and are more likely to crack under pressure. Could be a reason for the recommendation to use metal housings when ice diving.

+1 regarding the wrecks. A day boat from Hurghada to the Thistlegorm for example takes 3 hours one way. Much better on a liveaboard, easy to do an early morning dive and have the wreck for yourself before the day boats come. If you prefer a week of reef diving then some hotels are good too.

Did your physician bring up the topic of a PFO? Severe undeserved type II DCS after an uneventful benign NDL dive could also be related to a PFO combined with exertion, coughing, sneezing, Valsalva maneuver, ...

two remarks: 1) oxtox risk correlates also with high ppCO2 in your blood. Rebreather divers with failed scrubbers are at risk also at ppO2 1.3bar or lower. Exertion is an issue, maybe also natural CO2 retainers and skip breathers. Hence the idea that 1.6 is OK for quiet deco but not for the...

1.44" diameter makes 1.6 sq in, which is 67% of the usable surface area of a Perdix, or 55% of the OSTCplus, or 35% of the OSTC4. It should be obvious that a display somehow has to compensate for the fact that it is small. The fonts in the center are smaller, less data is shown, and/or the...

With only 40% of the screen area of the Perdix, and about 34% of a OSTCplus, it should be pretty obvious that the characters have to be either smaller, and/or more dense, and/or less information displayed. That may be totally OK for an NDL diver for example, but as soon as you have more than...

The Teric screen is even smaller (1.4") than the Perdix (2.2"), let alone the Eon steel, OSTC plus (2.4") or the OSTC4 (3.2"). Sure if you like a wristwatch computer that you can wear in your office as well, Teric is nice. But many divers prefer a large display dive computer particularly if...

A friend who teaches both PADI DM and CMAS*** (commercially, not in a club) explained to me that their content is similar, but in CMAS you get a lot more theory (physics, gas planning, staged decompression, physiology, ...) already at the CMAS* and CMAS** level, compared to PADI AOWD and RD...

I don't know, as said I wasn't on the boat, but their website says that 40m max, no deco, 12l/15l single tanks, Nitrox maybe, but doesn't mention Trimix or twin tanks. Maybe they offer more than what's on the website but then you better confirm before booking.

I did Northern & Dahab with redseaexplorers.com and enjoyed it very much. GUE infested but openminded, sidemount / rebreather / double tank / freediving friendly. Trimix, DPV, Nitrox, ... Started from Hurghada. I've seen the MY Blue but wasn't on it. Very different focus; no tech diving, no...

This post yes, but in practice you can either do TMX45 as an add-on to an existing Tec45 certification, or do Tec45 and Tec50 with TMX right from the start, e.g. Nitrox, Advanced Recreational Trimix, Normoxic & Trimix

There is PADI TMX 45 and TMX 50. You can do the deep dives of the Tec45 and Tec50 courses on Trimix, right? Tech through PADI or TDI?

I look and the "consistency" is a few and always the same guys, who elaborate their long hose primary donate superiority story to everybody who can't hear it anymore and doesn't bother to argue as it's useless. A loud ignored minority in an internet forum does not equate collective experience in...

Actually the work-of-breathing of the Mares MV is OK with 0.67J/l . The point is rather that a safe second is often tuned a bit harder by the factory or service guy, because you want it to work reliably but not accidentally freeflow. Sometimes it's too much and then people complain that their...